摘要
提出了一种基于马赫-曾德尔(Mach-Zehnder)干涉仪的光纤气体传感器。由于Mach-Zehnder干涉仪具有抑制光源噪声和模式噪声的特点,在高精度测量中越来越受到重视。在干涉仪的传感臂上涂有对待测气体敏感的薄膜,由于气体与敏感层的作用,导致光纤纤芯折射率发生变化,两臂的相位差发生变化,并引起干涉仪输出光强的变化和干涉条纹的平移,平移量与气体浓度对应。根据杨氏双缝干涉的理论,利用MATLAB对该研究进行计算机仿真,绘制出单色光的杨氏干涉图样和光强分布曲线,及气室中通入一定浓度的待测气体使干涉图样产生平移。
A fiber-optic gas sensor based on Mach-Zehnder interferometer was demonstrated.The Mach-Zehnder interferometer having the characteristics of suppressing source noise and mode noise was paid more and more attention in high-precision measurements.The sensing arm of the interferometer was coated with gas-sensitive film.The gas affected the sensitive film,and led to the changes of refractive index of fiber core and phase difference of two arms,and also caused the change of light output intensity of interferometer and the shift of interference fringe,and the variation of the shift was corresponding to the gas concentration.According to the theory of Young＇s double slit interference,Young＇s interference and light intensity distribution curve of monochromatic light by MATLAB were drew,and interference patterns shifted due to injecting a certain concentration of gases in the chamber.
出处
《光谱实验室》
CAS
CSCD
2012年第2期988-991,共4页
Chinese Journal of Spectroscopy Laboratory
